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Subject: Re: cgroup, RT reservation per core(s)?
From: Peter Zijlstra <peterz@infradead.org>
To: Rolando Martins <rolando.martins@gmail.com>
Cc: linux-kernel@vger.kernel.org
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Date: Mon, 09 Feb 2009 20:52:54 +0100
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On Mon, 2009-02-09 at 19:30 +0000, Rolando Martins wrote:
> Hi,
> I would like to have in a quad-core, 2 cores totally (100%) dedicated
> to RT tasks (SCHED_RR and SCHED_FIFO) and the other 2 cores with
> normal behavior, better said,  allowing SCHED_OTHER & SCHED_FIFO &
> SCHED_RR tasks but still with a RT reservation. Follows an example:
> 
> 
> # Setup first domain (cpu 0,1)
> echo 0-1 > /dev/cgroup/0/cpuset.cpus
> echo 0 > /dev/cgroup/0/cpuset.mems
> 
> # Setup RT bandwidth for firstdomain (80% for RT, 20% others)
> echo 1000000 > /dev/cgroup/0/cpu.rt_period_us
> echo 800000 > /dev/cgroup/0/cpu.rt_runtime_us
> 
> 
> # Setup second domain (cpu 2,3)
> mkdir /dev/cgroup/1
> echo 2-3 > /dev/cgroup/1/cpuset.cpus
> echo 0 > /dev/cgroup/1/cpuset.mems
> 
> # Setup RT bandwidth for second domain (100% for RT)
> echo 1000000 > /dev/cgroup/1/cpu.rt_period_us
> echo 1000000 > /dev/cgroup/1/cpu.rt_runtime_us
> 
> Is there anyway for doing this?

Nope, but why do you need bandwidth groups if all you want is a full
cpu?

Just the cpuset should be plenty